Office 365 Outlook, cannot add additional account

Hello,

i have a following situation.
Client is migrating from some 3rd party mail to Office 365. Currently using POP3. Autodiscover is pointing to Office 365.

Server 1: 3rd party, registered mydomain and mailbox with user@mydomain.com. MX pointing to it.
Office 365 Exchange, registered mydomain.com and mailbox for user@mydomain.com

What i usually do, for client with few users, is to configure Outlook to have both mailboxes (accounts), one for POP3 on 3rd party mail and second via autodiscover on Office 365, for (user@mydomain.com). This works if you have Outlook 2010 or 2013, and i am sure it worked for Outlook 2016 some time ago.
You open Outlook and simple get mailbox for user@mydomain.com (1) (POP3) and user@mydomain.com (o365)
After that, i migrate MX, and inform users to start using new mailbox tomorrow, and then migrate old mailbox to new one.

Problem is now, when you install Outlook 365, when you try to add account for exchange mailbox on o365, Outlook is going to report that account already exists, and you cannot add it.
Is there some workaround on this? Why it does not work as good as it was before :)

Regards.
LVL 18
IvanSystem EngineerAsked:
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Andrew LeniartSenior EditorCommented:
Hi Ivan,

I found that too. A workaround I figured out was to just add any other POP3 email account to Outlook 2016 and get it saved. Once saved, then edit the account in Outlook 2016 again and change all the fields as needed. That silly wizard that 2016 makes you use is a proverbial pain!
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Andrew LeniartSenior EditorCommented:
Sorry, I think I may have misread your question. I'm adding POP3 accounts. Not sure how to go about doing this with Exchange/365 accounts. Try the same trick only using a dummy spare exchange account perhaps. Might work?
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IvanSystem EngineerAuthor Commented:
Hi,

thanks for the info, will try it.

Regards.
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Andrew LeniartSenior EditorCommented:
Ivan, any news re: progress on this question?
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IvanSystem EngineerAuthor Commented:
Hi,

as of some  update for Outlook 2016, you are no longer able to add multiple accounts with same name, but hosted on different mail servers.
I have tried with older version of Outlook 2016, one from last year (dont have build number  here) and  it works.

Regards,
Ivan.
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IvanSystem EngineerAuthor Commented:
Close the case. TY
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